1 / 12

Geometry 400 vs. 824 km 45 degree nadir angle Spherical earth

marykbrown
Télécharger la présentation

Geometry 400 vs. 824 km 45 degree nadir angle Spherical earth

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Coherent Doppler Lidar Roadmap to Both the NRC Decadal Survey “Science Demonstration” and “Operational” MissionsMichael J. KavayaJirong YuUpendra SinghNASA Langley Research Centermichael.j.kavaya@nasa.govMulugeta PetrosScience and Technology Corp.Working Group on Space-Based Lidar WindsMonterey, California USA5 – 8 February 2008

  2. Geometry400 vs. 824 km45 degree nadir angleSpherical earth 400 – 48.5 s/350 km 824 – 53.1 s/350 km

  3. Geometry400 vs. 824 km45 degree nadir angle

  4. NASA/NOAA Wind Measurement RequirementsPart 1 of 3

  5. Pulsed Doppler Wind Lidar Concept Science Mission Operational Mission NRC 2007 Earth Science Decadal Survey Recommended Demonstration “3-D Winds” Mission in 2016 NRC 2007 Earth Science Decadal Survey Recommended Operational “3-D Winds” Mission in 2022

  6. NASA/NOAA 2008Wind Measurement Requirements Science Demonstration Mission Current Horizontal Wind Vertical Profile Observations ~23 km • Global averages • If 2 measurements in a box, pick best one • Emphasis on wind profiles vs. height Operational Mission Courtesy Dr. G. David Emmitt Note different color key

  7. Connecting Lidar Parameters to Measurement Performance Coherent Detection Doppler Wind Lidar • Equal Performance Parameter Linkages: • Note: better vertical resolution is a smaller value of “Vert Res” • If decrease (improve) Vert Res by a factor F, then increase E by a factor , or increase PRF by F, or increase D by • If increase number of azimuth angles NAZ by a factor F, then increase PRF by F, or increase Vert Res by F, or increase E by , or increase D by • If increase R by a factor F, then increase D by F, or increase E by F2, or increase PRF or Vert Res by F4

  8. Coherent Doppler Lidar Roadmap to Hybrid DWL Science and Operational Missions: Science Demonstration, 400 km Point Design With Requirements Exceeded Most desirable Least desirable *assume no SNR loss due to scanner effective aperture **Does not include spare lasers for each lidar

  9. Coherent Doppler Lidar Roadmap to Hybrid DWL Science and Operational Missions: Operational, 400 km Note: 250 mJ x 2 = 500 mJ *assume no SNR loss due to scanner effective aperture **Does not include spare lasers for each lidar Least desirable Most desirable

  10. Coherent Doppler Lidar Roadmap to Hybrid DWL Science and Operational Missions: Operational, 824 km Note: 500 mJ x 4.67 = 2330 mJ *assume no SNR loss due to scanner effective aperture **Does not include spare lasers for each lidar Different orbit period not included Most desirable Least desirable

  11. Status of LaRC 2-Micron Pulsed Laser Demonstrated Performance * 1 pulsette per pulse

  12. Brought to you by NASA, NOAA, IPO, and the Ad Council

More Related